CN107471801A - 一种铝塑膜专用的尼龙薄膜及其制作方法 - Google Patents
一种铝塑膜专用的尼龙薄膜及其制作方法 Download PDFInfo
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 19
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Abstract
本发明公开了一种铝塑膜专用的尼龙薄膜及其制作方法,尼龙薄膜由中间层以及分别复合在中间层上、下表面的表层构成,所述中间层与表层的厚度比为:74‑78:22‑26;所述表层含有如下质量份数的物质:尼龙6 55‑65份,特种尼龙35‑45份,抗粘连剂0.3‑0.7份;所述中间层中含有如下质量份数的物质:尼龙6 55‑65份,特种尼龙35‑45份;所述特种尼龙为PA612、PA610、PA1012中一种或者任意组合。本发明获得了具有拉伸强度以及拉伸率高且均匀的铝塑膜专用尼龙薄膜,具有耐冲深高的优点。
Description
技术领域
本发明属于尼龙薄膜技术领域,尤其涉及一种铝塑膜专用的尼龙薄膜及其制作方法。
背景技术
软包装锂离子电池采用同聚合物锂离子电池相类似的铝塑复合膜作为电池的外壳,取代一般锂离子电池的钢制或铝制外壳。这种铝塑复合膜大致可以分为三层:内层为粘结层,多采用聚乙烯或聚丙烯材料,起封口粘结作用;中间层为铝箔,能够防止电池外部水汽的渗入,同时防止内部电解液的渗出;外层为保护层,多采用高熔点的聚酯或尼龙材料,有很强的机械性能,防止外力对电池的损伤,起保护电池的作用。
目前市场上的尼龙薄膜材料,在纵向和横向上的拉伸强度非常不均匀,而且伸长率也非常不均匀,导致铝塑复合膜在固定的压力和速度下冲深,冲深2.5mm-3mm就会冲破。
发明内容
本发明所要解决的技术问题是提供一种纵横向拉伸强度大且均匀、纵横向伸长率大且均匀的铝塑膜专用的尼龙薄膜及其制备方法,以克服现在耐冲深低的不足。
为了解决上述技术问题,本发明采用如下的技术方案:
一种铝塑膜专用的尼龙薄膜,由中间层以及分别复合在中间层上、下表面的表层构成,所述中间层与表层的厚度比为:74-78:22-26;
所述表层含有如下质量份数的物质:
尼龙6 55-65份,
特种尼龙 35-45份,
抗粘连剂 0.3-0.7份;
所述中间层中含有如下质量份数的物质:
尼龙6 55-65份,
特种尼龙 35-45份;
所述特种尼龙为PA612、PA610、PA1012中一种或者任意组合。
所述抗粘连剂为二氧化硅或碳酸钙或碳酸镁。
另外,本发明还提供了一种热铝塑膜专用的尼龙薄膜的制作方法,该制作方法包括如下的步骤:
投料:表层的物质按下列重量比例投入干燥缸中:
尼龙6 55-65份,
特种尼龙 35-45份,所述特种尼龙为MXD6、PA612、PA610中一种或者任意组合,
抗粘连剂 0.3-0.7份,
中间层的物质按下列重量比例投入干燥缸中:
尼龙6 55-65份,
特种尼龙 35-45份;
所述尼龙6和所述特殊尼龙的粘度均为2.8-3.2;
特种尼龙为PA612、PA610、PA1012中一种或者任意组合;
原料干燥:采取蒸汽加热,温度达到90℃后开启真空泵进行干燥,30min后停止真空泵并充入氮气,取样测试水分,当干燥程度达到1000-1100ppm,干燥结束,否则重复干燥;
熔融挤出:原料干燥后进入挤出机,所述挤出机从加料口到挤出口的各段的温度依次为:第一进料段259-261℃,第二进料段269-271℃,第一熔融段274-276℃,第二熔融段279-281℃,第三熔融段279-281℃,第一挤出段274-276℃,第二挤出段269-271℃,第三挤出段269-271℃;原料通过挤出机熔化后,熔体经管道输送至T型模头流出到冷却辊,形成厚片,所述冷却辊的温度为21-23℃,速度为60-61rpm/min;通过调整中间层原料和表层原料的单位时间挤出量实现所述中间层与表层的厚度比为:74-78:22-26;
纵向拉伸:厚片经辊筒输送至纵向拉伸区域后依次进行预热、拉伸和定型,纵向拉伸比为3.1-3.4,拉伸方法为单点拉伸;所述纵向拉伸的预热分两段进行,第一预热段温度为49-51℃,第二预热段温度为57-59℃;所述纵向拉伸的拉伸分两段进行,第一拉伸段温度为61-63℃,第二拉伸段温度也为61-63℃;所述纵向拉伸的定型分两段进行,第一定型段温度为51-53℃,第二定型段温度为44-46℃;
横向拉伸:经纵向拉伸后的厚片进入横向拉伸区域后依次进行预热、拉伸、定型和冷却,横向拉伸比为3.8-4.2;所述横向拉伸的预热分三段进行,第一预热段温度为85~90℃,风速为17-19m/s,第二预热段温度为90~95℃,风速为17-19m/s,第三预热段温度为100~110℃,风速为17-19m/s;所述横向拉伸的拉伸分三段进行,第一拉升段的温度为100-110℃,风速为17-19m/s,第二拉伸段的温度为105-115℃,风速为17-19m/s,第三拉伸段的温度为107-115℃,风速为17-19m/s;所述横向拉伸的定型分七段进行,第一定型段的温度为169-171℃,风速为
12-14m/s,第二至第六定型段的温度均为220-225℃,第二至第五段定型的风速均为12-14m/s,第七定型段的温度为179-181℃,第六和第七定型段的风速均为13-15m/s,所述冷却段的温度为39-41℃,风速为13-15m/s。
通过采用上述技术方案,获得了具有拉伸强度以及拉伸率高且均匀的铝塑膜专用尼龙薄膜,具有耐冲深高的优点。
附图说明
图1为本发明的热铝塑膜专用的尼龙薄膜的结构剖视图。
具体实施方式
如图1所示,本实施例的铝塑膜专用的尼龙薄膜,由中间层100以及分别复合在中间层上、下表面的表层200构成,中间层与表层的厚度比为:25:8。其按照下列工艺制得。
投料:
表层的料按下列重量比投入干燥缸:
尼龙6 60份,
特种尼龙PA610 39.4份,
抗粘连剂二氧化硅 0.6份。
所述中间层中含有如下质量份数的物质:
尼龙6 60份,
特种尼龙PA612 40份。
中间层的料按下列重量比投入干燥缸:
尼龙6 60份,
特种尼龙PA610 40份;
尼龙6和特种尼龙的粘度均为2.8-3.2。
原料干燥:采取蒸汽加热,温度达到90℃后开启真空泵进行干燥,30min后停止真空泵并充入氮气,取样测试水分,当干燥程度达到1000-1100ppm,干燥结束,否则重复干燥;
熔融挤出:
原料干燥后进入挤出机,加料口采用真空保护,真空度稳定在-80kpa,挤出机从加料口到挤出口的各段温度如下表所示:
原料通过挤出机熔化后,熔体经管道输送至T型模头流出到冷却辊,形成厚片,所述冷却辊的温度为22℃,速度为60.5rpm/min。
在本步骤中,通过调整中间层原料和表层原料的单位时间挤出量,即调整各自齿轮泵的转速实现所述中间层与表层的厚度比为25:8,具体地是通过调整各自齿轮泵的转速来实现中间层和表层的厚度比。
纵向拉伸:
厚片经辊筒输送至纵向拉伸区域后依次进行预热、拉伸和定型,完成纵向拉伸。纵向拉伸比为3.1-3.4,拉伸方法为单点拉伸,纵向拉伸的各区段温度设置如下表:
为保证拉升比不变,防止拉伸不均匀,拉伸前后均有压辊压住厚片,压辊压力为0.3-0.5MPa。
横向拉伸:
经纵向拉伸后的厚片进入横向拉伸,依靠链夹夹住边部,链夹运行轨道越来越宽完成拉伸。横向拉升比为3.8-4.2。
横向拉伸分为预热、拉伸、定型、冷却四个区段。
横向拉伸各区段温度和风速设置如下表。
制得的铝塑膜专用的尼龙薄膜,经检测,性能指标如下:
并且还将该铝塑膜专用的尼龙薄膜用来制作铝塑复合膜样品,用样品做耐冲深试验,试验结果为:冲深到达5.0mm,样品不破。
但是,本技术领域中的普通技术人员应当认识到,以上的实施例仅是用来说明本发明,而并非用作为对本发明的限定,只要在本发明的实质精神范围内,对以上所述实施例的变化、变型都将落在本发明的权利要求书范围内。
Claims (4)
1.一种铝塑膜专用的尼龙薄膜,其特征在于:由中间层以及分别复合在中间层上、下表面的表层构成,所述中间层与表层的厚度比为:74-78:22-26;
所述表层含有如下质量份数的物质:
尼龙6 55-65份,
特种尼龙 35-45份,
抗粘连剂 0.3-0.7份;
所述中间层中含有如下质量份数的物质:
尼龙6 55-65份,
特种尼龙 35-45份;
所述特种尼龙为PA612、PA610、PA1012中一种或者任意组合。
2.根据权利要求1所述的铝塑膜专用的尼龙薄膜,其特征在于:所述抗粘连剂为二氧化硅或碳酸钙或碳酸镁。
3.一种热铝塑膜专用的尼龙薄膜的制作方法,其特征在于:该制作方法包括如下的步骤:
投料:表层的物质按下列重量比例投入干燥缸中:
尼龙6 55-65份,
特种尼龙 35-45份,所述特种尼龙为MXD6、PA612、PA610中一种或者任意组合,
抗粘连剂 0.3-0.7份,
中间层的物质按下列重量比例投入干燥缸中:
尼龙6 55-65份,
特种尼龙 35-45份;
特种尼龙为PA612、PA610、PA1012中一种或者任意组合;
原料干燥:采取蒸汽加热,温度达到90℃后开启真空泵进行干燥,30min后停止真空泵并充入氮气,取样测试水分,当干燥程度达到1000-1100ppm,干燥结束,否则重复干燥;
熔融挤出:原料干燥后进入挤出机,所述挤出机从加料口到挤出口的各段的温度依次为:第一进料段259-261℃,第二进料段269-271℃,第一熔融段274-276℃,第二熔融段279-281℃,第三熔融段279-281℃,第一挤出段274-276℃,第二挤出段269-271℃,第三挤出段269-271℃;原料通过挤出机熔化后,熔体经管道输送至T型模头流出到冷却辊,形成厚片,所述冷却辊的温度为21-23℃,速度为60-61rpm/min;通过调整中间层原料和表层原料的单位时间挤出量实现所述中间层与表层的厚度比为:74-78:22-26;
纵向拉伸:厚片经辊筒输送至纵向拉伸区域后依次进行预热、拉伸和定型,纵向拉伸比为3.1-3.4,拉伸方法为单点拉伸;所述纵向拉伸的预热分两段进行,第一预热段温度为49-51℃,第二预热段温度为57-59℃;所述纵向拉伸的拉伸分两段进行,第一拉伸段温度为61-63℃,第二拉伸段温度也为61-63℃;所述纵向拉伸的定型分两段进行,第一定型段温度为51-53℃,第二定型段温度为44-46℃;
横向拉伸:经纵向拉伸后的厚片进入横向拉伸区域后依次进行预热、拉伸、定型和冷却,横向拉伸比为3.8-4.2;所述横向拉伸的预热分三段进行,第一预热段温度为85~90℃,风速为17-19m/s,第二预热段温度为90~95℃,风速为17-19m/s,第三预热段温度为100~110℃,风速为17-19m/s;所述横向拉伸的拉伸分三段进行,第一拉升段的温度为100-110℃,风速为17-19m/s,第二拉伸段的温度为105-115℃,风速为17-19m/s,第三拉伸段的温度为107-115℃,风速为17-19m/s;所述横向拉伸的定型分七段进行,第一定型段的温度为169-171℃,风速为12-14m/s,第二至第六定型段的温度均为220-225℃,第二至第五段定型的风速均为12-14m/s,第七定型段的温度为179-181℃,第六和第七定型段的风速均为13-15m/s,所述冷却段的温度为39-41℃,风速为13-15m/s。
4.根据权利要求3所述的热铝塑膜专用的尼龙薄膜的制作方法,其特征在于:所述抗粘连剂为二氧化硅或碳酸钙或碳酸镁。
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